CVE-2025-66418VulnerabilityPublished 7 May 2026Updated 30 Oct 2026

Red Hat Security Advisory: General availability of the satellite/iop-puptoo-rhel9 container image

Affects Red HatSource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 7 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=6.18 <=6.18 Red Hat Red Hat Satellite Red Hat Satellite 6.18 amd64 registry.redhat.io/satellite/iop-puptoo-rhel9@sha256:45a0ac91d832d0d67b50b8a5423e1156d824f87f1046cdadefe4f7f09ff3adb5_amd64	Fixed in–

AI-suggested

Users should follow Red Hat Satellite documentation for installation and configuration of Red Hat Lightspeed. Since the vulnerability involves resource exhaustion via HTTP responses, consider limiting exposure to untrusted or malicious HTTP servers where possible. Monitor Red Hat advisories for updates or patches addressing these vulnerabilities. Customers with Red Hat Technical Account Managers (TAM) can seek direct guidance. No vendor advisory states that no action is required or that the issue is already mitigated.

Description

Red Hat Lightspeed in Satellite analyzes system health and configuration by applying predefined rules to a small set of local data, such as installed packages, running services, and configuration settings. When you install Red Hat Lightspeed in Satellite locally, you can generate Red Hat Lightspeed recommendations without sending system data to Red Hat services.

Impact

Exploitation of CVE-2025-66418 can lead to denial of service by exhausting CPU and memory resources on the client system running Red Hat Lightspeed in Satellite. This results in service disruption and unresponsiveness of affected applications. The impact is limited to resource consumption and does not affect confidentiality or integrity. No known active exploitation has been reported. The presence of additional CVEs suggests multiple security issues in the affected component, but specific impacts for those are not detailed.

Summary

The vulnerability CVE-2025-66418 in the urllib3 Python library allows a remote attacker to trigger a denial of service by exploiting an unbounded decompression chain in HTTP responses. This causes the client system to consume excessive CPU and memory resources, making applications unresponsive. This issue is present in Red Hat Satellite 6.18's Red Hat Lightspeed component, which analyzes system health locally. The advisory also includes CVE-2025-66471 and CVE-2026-21441 but does not provide details on those. Red Hat has published an advisory (RHSA-2026:14877) announcing the general availability of the satellite/iop-puptoo-rhel9 container image but does not list any fixes for these vulnerabilities. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling) and CWE-409 (possible race condition). No CVSS score is provided by Red Hat, and no known exploits are reported in the wild.

CWE-770Allocation of Resources Without Limits or Throttling (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #25
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Requirements
Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
Architecture and Design
Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V8.1.4 (opens in a new tab)
V13.4.1 (opens in a new tab)
V11.1.4 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Exponential Data Expansion (opens in a new tab)
Serialized Data Parameter Blowup (opens in a new tab)
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-409Improper Handling of Highly Compressed Data (Data Amplification) (opens in a new tab)
Base weakness
The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.2 (opens in a new tab)
V12.1.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Aug 2026, 17:53 UTC

WeaknessesCWE-770, CWE-409

Technical details

References

Community reviews

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